Flanging-machine.



G. W; SI E VERT. PLANGING MACHINE.

APPLICATION FILED 111x23, 1911.

Patented Jan. 12, 1915.

THE NORRIS PETERS CO.. PHOTO-LITHQ. WASHINGTON. D. C

STA

S PATENT OFFICE.

CHARLES W. SIEVERT, OF LOS ANGELES, CALIFORNIA, ASSIGNOR. OF ONE-HALF TO ALBERT H. SIEVEBT, 015 LOS ANGELES,-CALIFOR1 TIA.

FLANGING-MACHINE.

Application filed February 23, 1911.

To all whom it may concern:

Be it known that 1, CHARLES T/VILLIAMI SIEVERT, a citizen of the United States, residing at Los Angeles, county of Los Angeles, State of California, have invented new and useful Improvements in Flanging- Machines, of which the following is a specification.

This invention relates to improvements 1n my invention entitled flanging machines for which Letters Patent were issued to me on the 1st day of December, 1908 and bearing No. 905,376; and the invention relates to a flanging machine for making flanged tops of sheet iron for tanks or similar articles, and to a machine in which the flange is formed in small sections at one time, rather than the whole flange formed at one operation; and the objects of my invention are mainly to provide a means for making a perfectly smooth flange with a clean edge, and to provide a machine which may be easily operated by hand or by power.

My invention consists more particularly in the peculiar formation of the inner and outer formers and of the clamping foot which holds the disk of metal on the former. These configurations are so made that the edge of the disk is drawn down into a perfectly smooth flange in the manner which will hereinafter become apparent.

I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a vertical longitudinal section ofmy improved flanging machine. Fig. 2 is a horizontal plan section taken on line 2-2 of 'Fig. 1. Fig. 3 is a detail cross section taken on line 3-3 of Fig. 1.

A base or frame 5 is provided for the machine, being of suitable configuration, for the support of the parts to be hereinafter described and of suflicient weight and strength to withstand any pressure which may be applied thereto. At its front the base carries a supporting table 6 provided with an aperture 7 near the center of its upper face. A lug 8 on the lower face of former table 9 fits loosely into aperture 7. Former table 9 extends out away from the machine and is provided with a series of apertures 10 (or slotsmay be substituted) in which pin 11 is adaptedto be placed. Pin 11 forms the center on which disk 12 is swung, the disk being provided with a Specification of Letters Patent.

Patented Jan. 12, 1915.

Serial No. 610,326.

punched hole in its center for this purpose. For a disk of given diameter pin 11 is so placed that the edge of the disk overhangs the inner forming face 13 of former 14, as is shown in Fig. 2. Former 14: is made integral with former table 9 and the whole structure is loose upon supporting table 6. An adjustable screw 15 is mounted inframe 5 immediately below table 6 and presses against the rear face of former 14: at 16, holding the former up into the machine. The front, or forming, face of the former 1-1 is curved about a vertical axis as is shown in Fig. 2. This curve corresponds to the average curve of flange of the disks operated on by that particular former. For instance, its curvature can only correspond to the flange curvature of a flange centering where pin 11 is now shown in the drawings; but its correspondence to the curvatures of flanges centered on the other apertures 10 is close enough to give good practical results. Thus, in practice, each former is made to take flanges of diameters varying within certain limits found by practice to be best.

The upper face of former 14:, and of table 9 adjacent the former, is curved as is shown at 20 in Fig. 3. The lower face of a clamping foot 21 is also curved as shown at 22 in Fig. 3. Foot 21 is mounted on a lever 23 pivoted at 2 1 to frame 5. The other end of the lever is provided with an adjustable follower 25 engaging with a cam 26 mounted on shaft 27. Shaft 27 is the main operating shaft of themachine and carries handles 28 on each end. These handles 28 may be, and preferably are, joined together outside the machine so as to form a single handle for convenience in operating. Removably mounted on cam 26 is an outer former 29 having a forming face 30 of double curva ture. In the direction parallel to the movement of the former, or transverse to shaft 27 face 30 is conveX,-while in the direction transverse to its movement, or parallel to the shaft, the face 30 is concave. This is clearly shown by the two sections. The concavity of face 30 is not quite so great as the convexity of face 13 of inner former 14, so that the two faces only come together along a central line. Inner former 14 being loose, except for abutting screw '15, it is free to move to adjust itself to any position into which it is forced by contact with outer former 29.

In operating my machine, a flat disk of metal is placed upon table 9 in the position indicated, outer former 29 and handle 28 being in the position shown in dotted lines in Fig. 1. Handle 28 is then brought down toward the position shown in full lines. The first action of the machine is to bring foot 21 down on plate 12 and to force the engaged portion of theplate into the form shown in F ig. 3. This is accomplished by means of cam 26 coming into engagement with the follower 25. The follower will be held in the position shown by surface 35 on cam 26, which surface is concentric with shaft 27. After the plate has been thus clamped in position the lower portion 37 of face 30 of outer former 29 comes into contact with the edge of the plate projecting beyond the face 13 of inner former 14. As the handles are brought down the edge of the plate is gradually forced to the position shown in Fig. 1. WV hen, at last, the formed flange is forced up against face 13, face 30 of outer former 29 has moved up solidly against the outer face of the flange. This is provided for by making face 30, at the point shown in contact with the flange in Fig. 1 of less curvature than at the point 36, making the face at that point almost flat; and also by placing shaft 27 below the plane of the plate so that the circular movement of the outer former brings it closer to-the inner former at its upper edge. It is to be understood that the form given to disk 12, as shown in Fig. 3, is only a temporary one, that is, that portion of the disk adjacent the formers is temporarily forced into concavo-convex shape during the flanging operation, only a small portion of the disk and flange are affected at any given moment and whenthe foot 21 is released the disk immediately resumes its former flat form. The handle is then raised and the plate turned through an appropriate angle and the operation repeated. This is done as many times as is necessary to completely flange the plate. I

It will be seen that the circumference of the flange edge is much less after formation than before formation and that consequently a larger amount of material must be forced into the flange than is present in the normal plate. The cuiwature of the foot 21 and former 14c accomplishes this. By curving the plate in the direction shown, with the concavity toward the side on which the flange is to be formed, the periphery of the flange is thereby compressed while it is being formed and the material is forced into the flange without any folds or wrinkles. This curvature depends upon the size of the plate and the width of the flange, but'for a given diameter of plate and width of flange thereis always a radius of curvature which will enable a perfectly smooth flange to be formed.

Having described my invention, I claim:

1. In a flanging machine, the combination with a lower former having a convex flange forming end face and a convex upper clamping face near said end face and otherwise level, a clamping member having a lower concave clamping face to dish the sheet to be flanged near its edge during the flanging operation and means cooperating with the former for forming a flange on a sheet clamped between the clamping member and former.

2. In a flanging machine, the combination with an outer former having a convex upper face and a convex inner end face of a presser member having a concave under face for cooperation with the convex upper face of said former, a cam member, a former movable with said cam member, a manually operable member connected to said cam member, the last named former having a concave outer face, initial movement of the manually operable member serving to bring the presser member into forcible contact with the convex upper face of the inner former and continued movement of said manually operable member serving to move the cam carried former across the end face of the inner former.

3. In a flanging machine, the combination of an anvil having an edge about which the edge of a plate is turned to form a flange, the work engaging face of the anvil bein convex about an axis transverse to the wor c turning edge, a combined work clamp and bender comprising a foot with a concave face adapted to cooperate with the anvil to bend and clamp the plate, and means for turning the edge of the bent plate toward its concay e side around the edge of the anvil to form a flange.

4:. In a flanging machine, the combination of an anvil having an edge about which the edge of a plate is turned to form a flange, the work engaging face of the anvil being convex about an axis transverse to the work turning edge, a single means for clamping a plate on the convex face of the anvil and for bending the plate on the anvil, and means for turning the edge of the front plate toward its concave side around the edge of the anvil to form a flange.

In witness that I claim the foregoing I have hereunto subscribed my name this 14th day of February, 1911.

CHAS. W. SIEVERT.

Witnesses JAMES T. BARKELEW, A. H. SIEVERT.

topics of H11 patent may he obtained for five cents each, by addressing the Commissioner of Patents.

' Washington, D. G. 

